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duckweed will fill that need for you. it is hard to eradicate, but easy to control amount. you just scoop out what you don't want with the net and throw it away. it will cover the top of a big tank in about 3 - 4 weeks

120 Gallon Freshwater - Planted

“Every measure which establishes legal charity on a permanent basis and gives to it an administrative form creates thereby a class unproductive and idle, living at the expense of the class which is industrious and given to work.” -- Alexis de Tocqueville

What about a 12 gallon? 2 days?
If I don't get any replies from marineland/AC I will just use this. Hopefully its good at blocking reef light :P I hate the color too though. I hope I can replace it....
Anyway, thanks!